Little Mix star Leigh-Anne Pinnock was forced to pull out of one of the girls' shows after burning her legs.

In documentary footage filmed in April and shared on the girls' Twitter account on Wednesday, Leigh-Anne is left devastated when she has to skip a show for the first time after badly burning her legs with a steamer.

The star and her bandmates were using the vocal steamers ahead of their Anaheim, California gig, where they were supporting US pop star Ariana Grande.

The star suffered the accident when using her vocal steamer (Image: Little Mix)

Leigh-Anne is comforted by a pal (Image: Little Mix)

The clip shows a teary Leigh-Anne revealing that the contents of her steamer ended up going all over her legs because it was too full and she had it facing the wrong way.

"Oh, this is so embarrassing," Leigh-Ann says as she's helped into a wheelchair.

The star wells up as she realises she won't be able to perform (Image: Little Mix)